basic: make sure we include inttypes.h when we use its types

src/basic/cap-list.h

@@ -1,6 +1,8 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 #pragma once
 
+#include <inttypes.h>
+
 const char *capability_to_name(int id);
 int capability_from_name(const char *name);
 int capability_list_length(void);